Hot Water Boiler

Howdy all,

I am using a central hot water boiler in my house and it seems

I have to replace it every 2-3 years because it rusts through.

I have well water which has high iron content.

What I really want is a boiler with sacrificial anode, either

passive (magnesium) or active (electronic).

It seems that all boilers the local HW stores have don't have

sacrificial anodes, and my thai ain't good enough to explain

what I want to the sales clerks (and they typically have no

idea what I am talking about).

I have now tried a "instant hot water" unit, but that just

doesn't get the water as hot as I like it to be .... it's just

barely warm water ...

Any idea/suggestion where I can find what I am looking for ?

Are there units I can add the tanks I can buy locally ?

Thanks,

rudi